Three-manifold

Tags: #todo #subjects/geomtop #three-manifolds

Three-manifold

Take a look at Machlachlan and Reid’s book “The Arithmetic of Hyperbolic 3-Manifolds”. #resources

Since finite volume hyperbolic structures are unique whenever an n-manifold (n\geq 3) has them, any invariants of the hyperbolic structure are invariants of the manifold. Hyperbolic manifolds are K(\pi,1) spaces, so they’re not just diffeo/homeomorphism invariants, but invariants of the homotopy-type.

  • Rohklin invariant : a {\mathbb{Z}}/2 invariant r for \mathbb{Z}\operatorname{HS}^3
  • Casson invariant : a {\mathbb{Z}} invariant c for \mathbb{Z}\operatorname{HS}^3 where c\operatorname{mod}2 = r.
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